Structure of Atom Test

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Structure of Atom Test - 29

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Question 1
1 / -0

Identify the false statement among the following.

A
Heisenberg's principle is contradictory to Bohr's theory

B
Planck's quantum theory is taken as the basis for Bohr's theory

C
Splitting up of spectral lines in presence of external magnetic field is due to the existence of sub shells

D
Both A and C
Solution
1. Option A is true. Bohr gave the theory of fixed orbits, which was contradictory to Heisenberg’s theory.
2. Option B is true. The electrons can only orbit stably, without radiating, in certain orbits (called by Bohr the "stationary orbits") at a certain discrete set of distances from the nucleus. These orbits are associated with definite energies and are also called energy shells or energy levels. In these orbits, the electron's acceleration does not result in radiation and energy loss as required by classical electromagnetics. The Bohr model of an atom was based upon Planck's quantum theory of radiation.
3. Option C is false. Bohr theory could not explain the Zeeman effect. In presence of magnetic field, each spectral line gets split up into fine lines, the phenomenon, is known as Zeeman effect.
Hence, C is the answer.
Question 2
1 / -0

Bohr's model explains:

A
the spectrum of hydrogen atom only

B
the spectrum of any atom or ion having one electron only

C
the spectrum of hydrogen molecule

D
the solar spectrum

Solution

Bohr's model successfully explained the spectrum of an atom or ion having one electron only.
Question 3
1 / -0

An electron in hydrogen atom is excited to 'N' shell. What are the possible transitions it can undergo? Compare the energies of transitions.

A
3 transitions, energies goes on decreasing

B
2 transitions, energies goes on decreasing

C
3 transitions, energies goes on increasing

D
2 transitions, energies goes on increasing

Solution

When an electron is in 'N' shell $$(n = 4)$$, it can undergo transition to $$n = 3, n = 2, n = 1\ shells$$. Therefore 3 electron transitions are possible. $$n = 4 \:to \:n = 3$$, is the least energy transition since the difference in energies of the two orbits is the least. $$n = 4 \:to \:n=1$$ corresponds to highest energy transition.
Question 4
1 / -0

Identify the correct order of filling up of electrons in sub shells - 4p, 5s, 4d, 5p.

A
4p, 5s, 4d, 5p

B
4p, 4d, 5s, 5p

C
5s, 5p, 4p, 4d

D
4p, 5p, 5s, 5p
Question 5
1 / -0

Atomic number of Bismuth is:

A
84

B
85

C
83

D
82

Solution

The number of protons found in the nucleus of an atom of a given element is called atomic number. Elements are placed in periodic table according to their atomic number. Atomic number increases from left to right and top to bottom of periodic table. Higher the atomic number, heavier is the atom.
Example:- $$^4_2He\longrightarrow$$ Atomic number $$2$$ and mass number is $$4$$. $$[He\longrightarrow Helium]$$
$$^{208.9}_{83}Bi\longrightarrow$$ Atomic number is $$83$$ and mass number is $$208.9$$. $$[Bi\longrightarrow Bismuth]$$
Question 6
1 / -0

The principal quantum number increases, the difference of energy between consecutive energy levels:

A
decreases

B
increases

C
remain same

D
sometimes increases and sometimes decreases

Solution

Difference in energy is given as; $$\Delta E = -\frac{Z^{2}R}{n^{2}}.$$
Therefore, as principal quantum number(n) increases the energy of transition decreases.
A negative sign indicates the spin of electron.
Question 7
1 / -0

Energy of the electron in Bohr's orbit is equal to ?

A
potential energy only

B
Kinetic energy only

C
Sum of potential and kinetic energy

D
difference of kinetic and potential energy

Solution

Energy of electron in Bohr orbit is equal to sum of kinetic and potential energy
$$\triangle E\quad =\quad KE\quad +\quad PE$$
Because of orbital energy is PE and electron revolving energy is kinetic energy
Question 8
1 / -0

Atomic number of Radium is:

A
84

B
88

C
86

D
76

Solution

The number of protons found in the nucleus of an tom of a given element is called atomic number. Elements that are placed in periodic table according to their atomic number.
Example:-
(1) Atomic number of Radium is $$88$$
$$^{226}_{88}Ra$$
(2) Atomic number of Barium is $$56$$
$$^{137.3}_{56}Ba$$
Question 9
1 / -0

How will you find out the maximum number of electrons in the main energy level?

A
$$n$$

B
$$n^2$$

C
$$2n^4$$

D
$$2n^2$$

Solution

The maximum number of electrons in an energy level is given by $$2\left( { n }^{ 2 } \right) $$. Here n is the principle quantum number of the energy level. Thus we have $$2\left( { 1 }^{ 2 } \right) =2$$ electrons in first orbit and $$8$$ in second orbit and so on.
Question 10
1 / -0

Atomic number of Radon is:

A
54

B
86

C
72

D
68

Solution

The number of protons found in the nucleus of an atom of a given element is called atomic number. Elements are placed in periodic tablee according to their atomic number.
Example:-
(1) Atomic number of Radon is $$86$$
$$^{222}_{86}R$$
(2) Atomic number of Bromine is $$35$$
$$^{79.9}_{35}Br$$

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 29

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Structure of Atom Test - 29

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SHARING IS CARING

Question 1

Heisenberg's principle is contradictory to Bohr's theory

Planck's quantum theory is taken as the basis for Bohr's theory

Splitting up of spectral lines in presence of external magnetic field is due to the existence of sub shells

Both A and C

Solution

Question 2

the spectrum of hydrogen atom only

the spectrum of any atom or ion having one electron only

the spectrum of hydrogen molecule

the solar spectrum

Solution

Question 3

3 transitions, energies goes on decreasing

2 transitions, energies goes on decreasing

3 transitions, energies goes on increasing

2 transitions, energies goes on increasing

Solution

Question 4

4p, 5s, 4d, 5p

4p, 4d, 5s, 5p

5s, 5p, 4p, 4d

4p, 5p, 5s, 5p

Question 5

84

85

83

82

Solution

Question 6

decreases

increases

remain same

sometimes increases and sometimes decreases

Solution

Question 7

potential energy only

Kinetic energy only

Sum of potential and kinetic energy

difference of kinetic and potential energy

Solution

Question 8

84

88

86

76

Solution

Question 9

$$n$$

$$n^2$$

$$2n^4$$

$$2n^2$$

Solution

Question 10

54

86

72

68

Solution

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